Above is another great amphitheatre, floored with rocky layers, upon which the stream flows in gentler course. In this is the Milldam Fall, a ledge about fourteen feet high, over which the waters make a uniform flow all across the ravine. This has above it an expanded platform of level slabs almost a hundred feet wide, fringed on each side with cedars, the attractive place being called the Alhambra. At the upper end a naked rock protrudes about sixty feet high, from which a stream falls as a perpetual shower-bath. The creek rushes down another complex stairway in the Alhambra Cascade. The ravine above suddenly contracts, and the walls beyond change their forms into shapes of curves and projections. Another cascade of whirling, foaming waters is passed, and a new amphitheatre entered, where great slabs of rock have fallen from the walls and lie on the floor, ready to be driven down the ravine by freshets. The torrent here develops another curious formation, known as the Rocky Heart. Curved holes are being rounded out by whirling boulders of granite, which are kept constantly revolving by the running water, and thus readily act upon the softer limestones. The chasm goes still farther up to the Prospect Falls, a cataract twenty feet high, near the beginning of the ravine. Canada Creek passes out of the lower end of the gorge, where the limestone layers are exhausted, and their edges fall off in terraces sharply to the lower level, and almost down to the surface of the stream. All about the broadened channel, as it flows away towards the Mohawk, lie the huge slabs and boulders driven down through the chasm by repeated freshets, with the amber waters foaming among them. This wonderful ravine is a geological mine, disclosing the transition rocks, the first containing fossil organic remains. In the lower part of the chasm they are compact carbonate of lime, extremely hard and brittle, and a dark blue, almost black, in color. At the High Fall, and above to the Rocky Heart, the upper strata are from twelve to eighteen inches thick, and composed of the crystallized fragments of the vertebræ of crinoidea and the shells of terebratulæ. These fossils of the Silurian period are numerous. The strata throughout the chasm are remarkably horizontal, varying, as they ascend, from one inch to eighteen inches in thickness. They are very distinct, and separated by a fine shaly substance which disintegrates upon exposure to the air or moisture. From the top to the bottom of the ravine small cracks extend down perpendicularly, and run in a straight line through the whole mass across the stream. These divide the pavements into rhomboidal slabs. The most interesting fossils are found, among them the large trilobite, a crustacean that could both swim and crawl upon the bottom of the sea. This extraordinary place is in reality a Titanic fissure, cracked through the crust of mother earth, down which roars and dashes a tremendous torrent. THE LAKES OF NEW YORK.